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href="/categories/Web-APIs%E7%AC%94%E8%AE%B0/">Web APIs笔记</a></span></div><div class="meta-secondline"><span class="post-meta-separator">|</span><span data-flag-title="Web APIs第五天"><i class="far fa-eye fa-fw post-meta-icon"></i><span class="post-meta-label">阅读量:</span><span id="twikoo_visitors"><i class="fa-solid fa-spinner fa-spin"></i></span></span></div></div></div></header><main class="layout" id="content-inner"><div id="post"><article class="post-content" id="article-container"><h3 id="DOM-网页特效"><a href="#DOM-网页特效" class="headerlink" title="DOM- 网页特效"></a>DOM- 网页特效</h3><h2 id="1-滚动事件和加载事件"><a href="#1-滚动事件和加载事件" class="headerlink" title="1. 滚动事件和加载事件"></a>1. 滚动事件和加载事件</h2><h3 id="1-滚动事件scroll"><a href="#1-滚动事件scroll" class="headerlink" title="1. 滚动事件scroll"></a>1. 滚动事件scroll</h3><ol><li><p>当页面进行滚动时触发的事件</p></li><li><p>很多网页需要检测用户把页面滚动到某个区域后做一些处理， 比如固定导航栏，比如返回顶部</p></li><li><p>监听整个页面滚动给 window 或 document 加</p></li><li><p>监听某个元素的内部滚动直接给某个元素加即可</p></li></ol><figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br></pre></td><td class="code"><pre><span class="line">监听整个页面滚动</span><br><span class="line"><span class="comment">// 1. 滚动事件 监听整个页面滚动 固定导航/返回顶部</span></span><br><span class="line"><span class="variable language_">window</span>.<span class="title function_">addEventListener</span>(<span class="string">&#x27;scroll&#x27;</span>, <span class="keyword">function</span> (<span class="params"></span>) &#123;</span><br><span class="line">    <span class="variable language_">console</span>.<span class="title function_">log</span>(<span class="number">1</span>)</span><br><span class="line">&#125;)</span><br><span class="line"><span class="keyword">let</span> num1 = <span class="variable language_">document</span>.<span class="title function_">querySelector</span>(<span class="string">&#x27;.box&#x27;</span>)</span><br><span class="line">num1.<span class="title function_">addEventListener</span>(<span class="string">&#x27;scroll&#x27;</span>, <span class="keyword">function</span> (<span class="params"></span>) &#123;</span><br><span class="line">    <span class="variable language_">console</span>.<span class="title function_">log</span>(<span class="number">2</span>)</span><br><span class="line">&#125;)</span><br></pre></td></tr></table></figure><h3 id="2-加载事件load"><a href="#2-加载事件load" class="headerlink" title="2. 加载事件load"></a>2. 加载事件load</h3><ol><li><p>加载外部资源（如图片、外联CSS和JavaScript等）加载完毕时触发的事件</p></li><li><p>有些时候需要等页面资源全部处理完了做一些事情</p></li><li><p>老代码喜欢把 script 写在 head 中，这时候直接找 dom 元素找不到</p></li><li><p>注意：不光可以监听整个页面资源加载完毕，也可以针对某个资源绑定load事件</p></li></ol><p>监听页面所有资源加载完毕：</p><figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br></pre></td><td class="code"><pre><span class="line">监听整个页面资源给 <span class="variable language_">window</span> 加</span><br><span class="line"><span class="comment">// 2. 加载事件 监听页面资源加载完毕才执行load事件</span></span><br><span class="line"><span class="comment">// 也可以针对别的资源绑定load事件</span></span><br><span class="line"><span class="comment">// 把js写在head上面 导致dom元素找不到 用load事件</span></span><br><span class="line"><span class="keyword">let</span> n1 = <span class="variable language_">document</span>.<span class="title function_">querySelector</span>(<span class="string">&#x27;.box&#x27;</span>)</span><br><span class="line"><span class="variable language_">window</span>.<span class="title function_">addEventListener</span>(<span class="string">&#x27;load&#x27;</span>, <span class="keyword">function</span> (<span class="params"></span>) &#123;</span><br><span class="line">    <span class="variable language_">console</span>.<span class="title function_">log</span>(<span class="number">11</span>)</span><br><span class="line">&#125;)</span><br></pre></td></tr></table></figure><h3 id="3-加载事件DOMContentLoaded"><a href="#3-加载事件DOMContentLoaded" class="headerlink" title="3. 加载事件DOMContentLoaded"></a>3. 加载事件DOMContentLoaded</h3><ol><li>当初始的 HTML 文档被完全加载和解析完成之后，DOMContentLoaded 事件被触发，而无需等待样式表 、图像等完全加载</li></ol><p>监听页面DOM加载完毕：</p><figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br></pre></td><td class="code"><pre><span class="line">给 <span class="variable language_">document</span> 添加 <span class="title class_">DOMContentLoaded</span> 事件</span><br><span class="line"><span class="comment">// 2. 加载事件 等HTML文档加载完后再加载 无需等样式 图片就可以加载</span></span><br><span class="line"><span class="variable language_">document</span>.<span class="title function_">addEventListener</span>(<span class="string">&#x27;DOMContentLoaded&#x27;</span>, <span class="keyword">function</span> (<span class="params"></span>) &#123;</span><br><span class="line">    <span class="variable language_">console</span>.<span class="title function_">log</span>(<span class="number">3</span>)</span><br><span class="line">&#125;)</span><br></pre></td></tr></table></figure><h2 id="2-scroll家族"><a href="#2-scroll家族" class="headerlink" title="2. scroll家族"></a>2. scroll家族</h2><ol><li><p>我们想要页面滚动一段距离，比如100px，就让某些元素显示隐藏, 就可以使用scroll 来检测页面滚动的距离~~~</p></li><li><p>获取宽高: 获取元素的内容总宽高（不包含滚动条）返回值不带单位</p></li><li><p>scrollWidth和scrollHeight</p></li></ol><h5 id="获取位置"><a href="#获取位置" class="headerlink" title="获取位置:"></a>获取位置:</h5><ol><li><p>获取元素内容往左、往上滚出去看不到的距离</p></li><li><p>scrollLeft和scrollTop</p></li><li><p>这两个属性是可以修改的</p></li></ol><figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">// 1. scroll家族 (了解)</span></span><br><span class="line"><span class="keyword">let</span> num1 = <span class="variable language_">document</span>.<span class="title function_">querySelector</span>(<span class="string">&#x27;.box&#x27;</span>)</span><br><span class="line"><span class="comment">// // 当前宽度 不包含滚动条</span></span><br><span class="line"><span class="variable language_">console</span>.<span class="title function_">log</span>(num1.<span class="property">scrollWidth</span>)</span><br><span class="line"><span class="comment">// // 内容高度</span></span><br><span class="line"><span class="variable language_">console</span>.<span class="title function_">log</span>(num1.<span class="property">scrollHeight</span>)</span><br><span class="line"></span><br><span class="line"><span class="comment">// // 2. 被卷去的头部和左侧</span></span><br><span class="line">num1.<span class="title function_">addEventListener</span>(<span class="string">&#x27;scroll&#x27;</span>, <span class="keyword">function</span> (<span class="params"></span>) &#123;</span><br><span class="line">    <span class="variable language_">console</span>.<span class="title function_">log</span>(<span class="variable language_">this</span>.<span class="property">scrollTop</span>)</span><br><span class="line">&#125;)</span><br></pre></td></tr></table></figure><h5 id="开发中，我们经常检测页面滚动的距离，比如页面滚动100像素，就可以显示一个元素，或者固定一个元素"><a href="#开发中，我们经常检测页面滚动的距离，比如页面滚动100像素，就可以显示一个元素，或者固定一个元素" class="headerlink" title="开发中，我们经常检测页面滚动的距离，比如页面滚动100像素，就可以显示一个元素，或者固定一个元素"></a>开发中，我们经常检测页面滚动的距离，比如页面滚动100像素，就可以显示一个元素，或者固定一个元素</h5><ol><li>document.documentElement HTML 文档返回对象为HTML元素</li></ol><figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">// 3. 检测页面滚动的距离</span></span><br><span class="line"><span class="variable language_">window</span>.<span class="title function_">addEventListener</span>(<span class="string">&#x27;scroll&#x27;</span>, <span class="keyword">function</span> (<span class="params"></span>) &#123;</span><br><span class="line">    <span class="comment">// 返回HTML元素距离</span></span><br><span class="line">    <span class="variable language_">console</span>.<span class="title function_">log</span>(<span class="variable language_">document</span>.<span class="property">documentElement</span>.<span class="property">scrollTop</span>)</span><br><span class="line">    <span class="comment">// 可以给值/修改 但不要带单位</span></span><br><span class="line">    <span class="variable language_">document</span>.<span class="property">documentElement</span>.<span class="property">scrollTop</span> = <span class="number">200</span></span><br><span class="line">&#125;)</span><br></pre></td></tr></table></figure><ol><li><p>被卷去的头部或者左侧用那个属性？是否可以读取和修改？</p></li><li><p>可以读取，也可以修改（赋值）</p></li></ol><h4 id="页面滚动显示返回顶部按钮"><a href="#页面滚动显示返回顶部按钮" class="headerlink" title="页面滚动显示返回顶部按钮"></a>页面滚动显示返回顶部按钮</h4><figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br></pre></td><td class="code"><pre><span class="line">需求：当页面滚动<span class="number">500</span>像素，就显示返回顶部按钮，否则隐藏， 同时点击按钮，则返回顶部</span><br><span class="line">①：用到页面滚动事件</span><br><span class="line">②：检测页面滚动大于等于<span class="number">100</span>像素，则显示按钮</span><br><span class="line">③：点击按钮，则让页面的scrollTop 重置为 <span class="number">0</span></span><br><span class="line">&lt;div <span class="keyword">class</span>=<span class="string">&quot;content&quot;</span>&gt;&lt;/div&gt;</span><br><span class="line"><span class="language-xml"><span class="tag">&lt;<span class="name">div</span> <span class="attr">class</span>=<span class="string">&quot;backtop&quot;</span>&gt;</span></span></span><br><span class="line"><span class="language-xml">    <span class="tag">&lt;<span class="name">img</span> <span class="attr">src</span>=<span class="string">&quot;./images/close2.png&quot;</span> <span class="attr">alt</span>=<span class="string">&quot;&quot;</span>&gt;</span></span></span><br><span class="line"><span class="language-xml">    <span class="tag">&lt;<span class="name">a</span> <span class="attr">href</span>=<span class="string">&quot;javascript:;&quot;</span>&gt;</span><span class="tag">&lt;/<span class="name">a</span>&gt;</span></span></span><br><span class="line"><span class="language-xml"><span class="tag">&lt;/<span class="name">div</span>&gt;</span></span></span><br><span class="line"><span class="language-xml">let btn = document.querySelector(&#x27;.backtop&#x27;)</span></span><br><span class="line"><span class="language-xml">// 1. 页面滚动事件</span></span><br><span class="line"><span class="language-xml">window.addEventListener(&#x27;scroll&#x27;, function () &#123;</span></span><br><span class="line"><span class="language-xml">    // 2. 页面检测滚动距离</span></span><br><span class="line"><span class="language-xml">    let num1 = document.documentElement.scrollTop</span></span><br><span class="line"><span class="language-xml">    // 3. 判断显示隐藏</span></span><br><span class="line"><span class="language-xml">    // 如果大于200 就显示 小于隐藏</span></span><br><span class="line"><span class="language-xml">    if (num1 &gt;= 200) &#123;</span></span><br><span class="line"><span class="language-xml">        btn.style.display = &#x27;block&#x27;</span></span><br><span class="line"><span class="language-xml">    &#125; else &#123;</span></span><br><span class="line"><span class="language-xml">        btn.style.display = &#x27;none&#x27;</span></span><br><span class="line"><span class="language-xml">    &#125;</span></span><br><span class="line"><span class="language-xml">&#125;)</span></span><br><span class="line"><span class="language-xml"></span></span><br><span class="line"><span class="language-xml">// 4. 点击链接返回顶部</span></span><br><span class="line"><span class="language-xml">btn.children[1].addEventListener(&#x27;click&#x27;, function () &#123;</span></span><br><span class="line"><span class="language-xml">    document.documentElement.scrollTop = 0</span></span><br><span class="line"><span class="language-xml">&#125;)</span></span><br></pre></td></tr></table></figure><h2 id="3-offset家族"><a href="#3-offset家族" class="headerlink" title="3.offset家族"></a>3.offset家族</h2><ol><li><p>使用场景： 前面案例滚动多少距离，都是我们自己算的，最好是页面 滚动到某个元素，就可以做某些事</p></li><li><p>简单说，就是通过js的方式，得到元素在页面中的位置 这样我们可以做，页面滚动到这个位置，就可以返回 顶部的小盒子显示…</p></li></ol><h4 id="获取宽高"><a href="#获取宽高" class="headerlink" title="获取宽高:"></a>获取宽高:</h4><ol><li>获取元素的自身宽高、包含元素自身设置的宽高、padding、border, offsetWidth和offsetHeight</li></ol><figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">// 1. offset家族 宽高 (了解)</span></span><br><span class="line"><span class="keyword">let</span> num1 = <span class="variable language_">document</span>.<span class="title function_">querySelector</span>(<span class="string">&#x27;.box&#x27;</span>)</span><br><span class="line"><span class="comment">// 盒子大小 = 盒子本身宽高 + padding + border</span></span><br><span class="line"><span class="comment">// 盒子多大 offset就多大</span></span><br><span class="line"><span class="variable language_">console</span>.<span class="title function_">log</span>(num1.<span class="property">offsetWidth</span>)</span><br><span class="line"><span class="variable language_">console</span>.<span class="title function_">log</span>(num1.<span class="property">offsetHeight</span>)</span><br></pre></td></tr></table></figure><h4 id="获取位置-1"><a href="#获取位置-1" class="headerlink" title="获取位置:"></a>获取位置:</h4><ol><li><p>获取元素距离自己定位父级元素的左、上距离</p></li><li><p>offsetLeft和offsetTop 注意是只读属性</p></li></ol><figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">// 2. 位置以带定位的父级 如果没有就以左上角为准</span></span><br><span class="line"><span class="variable language_">console</span>.<span class="title function_">log</span>(num1.<span class="property">offsetTop</span>)</span><br><span class="line"><span class="variable language_">console</span>.<span class="title function_">log</span>(num1.<span class="property">offsetLeft</span>)</span><br></pre></td></tr></table></figure><h4 id="仿京东固定导航栏案例"><a href="#仿京东固定导航栏案例" class="headerlink" title="仿京东固定导航栏案例"></a>仿京东固定导航栏案例</h4><figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br></pre></td><td class="code"><pre><span class="line">当页面滚动到秒杀模块，导航栏自动滑入，否则滑出</span><br><span class="line">①：用到页面滚动事件</span><br><span class="line">②：检测页面滚动大于等于 秒杀模块的位置 则滑入，否则滑出</span><br><span class="line">&lt;div <span class="keyword">class</span>=<span class="string">&quot;header&quot;</span>&gt;我是顶部导航栏&lt;/div&gt;</span><br><span class="line"><span class="language-xml"><span class="tag">&lt;<span class="name">div</span> <span class="attr">class</span>=<span class="string">&quot;content&quot;</span>&gt;</span></span></span><br><span class="line"><span class="language-xml">    <span class="tag">&lt;<span class="name">div</span> <span class="attr">class</span>=<span class="string">&quot;sk&quot;</span>&gt;</span>秒杀模块<span class="tag">&lt;/<span class="name">div</span>&gt;</span></span></span><br><span class="line"><span class="language-xml"><span class="tag">&lt;/<span class="name">div</span>&gt;</span></span></span><br><span class="line"><span class="language-xml"><span class="tag">&lt;<span class="name">div</span> <span class="attr">class</span>=<span class="string">&quot;backtop&quot;</span>&gt;</span></span></span><br><span class="line"><span class="language-xml">    <span class="tag">&lt;<span class="name">img</span> <span class="attr">src</span>=<span class="string">&quot;./images/close2.png&quot;</span> <span class="attr">alt</span>=<span class="string">&quot;&quot;</span>&gt;</span></span></span><br><span class="line"><span class="language-xml">    <span class="tag">&lt;<span class="name">a</span> <span class="attr">href</span>=<span class="string">&quot;javascript:;&quot;</span>&gt;</span><span class="tag">&lt;/<span class="name">a</span>&gt;</span></span></span><br><span class="line"><span class="language-xml"><span class="tag">&lt;/<span class="name">div</span>&gt;</span></span></span><br><span class="line"><span class="language-xml">let box = document.querySelector(&#x27;.sk&#x27;)</span></span><br><span class="line"><span class="language-xml">let head = document.querySelector(&#x27;.header&#x27;)</span></span><br><span class="line"><span class="language-xml">// 1.页面滚动事件</span></span><br><span class="line"><span class="language-xml">window.addEventListener(&#x27;scroll&#x27;, function () &#123;</span></span><br><span class="line"><span class="language-xml">// 2.检测页面滚动距离 &gt;= 秒杀模块的offsetTop 则划入</span></span><br><span class="line"><span class="language-xml">    if (document.documentElement.scrollTop &gt;= box.offsetTop) &#123;</span></span><br><span class="line"><span class="language-xml">// 3.如果大于则显示 小于则-80px</span></span><br><span class="line"><span class="language-xml">        head.style.top = &#x27;0px&#x27;</span></span><br><span class="line"><span class="language-xml">    &#125; else &#123;</span></span><br><span class="line"><span class="language-xml">        head.style.top = &#x27;-80px&#x27;</span></span><br><span class="line"><span class="language-xml">    &#125;</span></span><br><span class="line"><span class="language-xml">&#125;)</span></span><br></pre></td></tr></table></figure><h4 id="电梯导航案例"><a href="#电梯导航案例" class="headerlink" title="电梯导航案例"></a>电梯导航案例</h4><figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br></pre></td><td class="code"><pre><span class="line">需求：点击可以页面调到指定效果</span><br><span class="line">①：点击当前 小导航，当前添加active，其余移除active</span><br><span class="line">②：得到对应 内容 的 offsetTop值</span><br><span class="line">③：让页面的 scrollTop 走到 对应 内容 的 offsetTop</span><br><span class="line">&lt;div <span class="keyword">class</span>=<span class="string">&quot;aside&quot;</span>&gt;</span><br><span class="line">    <span class="language-xml"><span class="tag">&lt;<span class="name">div</span> <span class="attr">class</span>=<span class="string">&quot;item active&quot;</span>&gt;</span>男装/女装<span class="tag">&lt;/<span class="name">div</span>&gt;</span></span></span><br><span class="line">    <span class="language-xml"><span class="tag">&lt;<span class="name">div</span> <span class="attr">class</span>=<span class="string">&quot;item&quot;</span>&gt;</span>儿童服装/游乐园<span class="tag">&lt;/<span class="name">div</span>&gt;</span></span></span><br><span class="line">    <span class="language-xml"><span class="tag">&lt;<span class="name">div</span> <span class="attr">class</span>=<span class="string">&quot;item&quot;</span>&gt;</span>电子产品<span class="tag">&lt;/<span class="name">div</span>&gt;</span></span></span><br><span class="line">    <span class="language-xml"><span class="tag">&lt;<span class="name">div</span> <span class="attr">class</span>=<span class="string">&quot;item&quot;</span>&gt;</span>电影/美食<span class="tag">&lt;/<span class="name">div</span>&gt;</span></span></span><br><span class="line">&lt;/div&gt;</span><br><span class="line"><span class="language-xml"><span class="tag">&lt;<span class="name">div</span> <span class="attr">class</span>=<span class="string">&quot;content&quot;</span>&gt;</span></span></span><br><span class="line"><span class="language-xml">    <span class="tag">&lt;<span class="name">div</span> <span class="attr">class</span>=<span class="string">&quot;neirong content1&quot;</span>&gt;</span>男装/女装<span class="tag">&lt;/<span class="name">div</span>&gt;</span></span></span><br><span class="line"><span class="language-xml">    <span class="tag">&lt;<span class="name">div</span> <span class="attr">class</span>=<span class="string">&quot;neirong content2&quot;</span>&gt;</span>儿童服装/游乐园<span class="tag">&lt;/<span class="name">div</span>&gt;</span></span></span><br><span class="line"><span class="language-xml">    <span class="tag">&lt;<span class="name">div</span> <span class="attr">class</span>=<span class="string">&quot;neirong content3&quot;</span>&gt;</span>电子产品<span class="tag">&lt;/<span class="name">div</span>&gt;</span></span></span><br><span class="line"><span class="language-xml">    <span class="tag">&lt;<span class="name">div</span> <span class="attr">class</span>=<span class="string">&quot;neirong content4&quot;</span>&gt;</span>电影/美食<span class="tag">&lt;/<span class="name">div</span>&gt;</span></span></span><br><span class="line"><span class="language-xml"><span class="tag">&lt;/<span class="name">div</span>&gt;</span></span></span><br><span class="line"><span class="keyword">let</span> btn = <span class="variable language_">document</span>.<span class="title function_">querySelectorAll</span>(<span class="string">&#x27;.item&#x27;</span>)</span><br><span class="line"><span class="keyword">let</span> btn1 = <span class="variable language_">document</span>.<span class="title function_">querySelectorAll</span>(<span class="string">&#x27;.neirong&#x27;</span>)</span><br><span class="line"><span class="comment">// 1. 点击谁谁添加类</span></span><br><span class="line"><span class="keyword">for</span> (<span class="keyword">let</span> num1 = <span class="number">0</span>; num1 &lt; btn.<span class="property">length</span>; num1++) &#123;</span><br><span class="line">    btn[num1].<span class="title function_">addEventListener</span>(<span class="string">&#x27;click&#x27;</span>, <span class="keyword">function</span> (<span class="params"></span>) &#123;</span><br><span class="line">        <span class="variable language_">document</span>.<span class="title function_">querySelector</span>(<span class="string">&#x27;.aside .active&#x27;</span>).<span class="property">classList</span>.<span class="title function_">remove</span>(<span class="string">&#x27;active&#x27;</span>)</span><br><span class="line">        <span class="variable language_">this</span>.<span class="property">classList</span>.<span class="title function_">add</span>(<span class="string">&#x27;active&#x27;</span>)</span><br><span class="line">        <span class="comment">// 2. 右侧内容跟随走动</span></span><br><span class="line">        <span class="comment">// 让页面滚动对应offsettop值位置</span></span><br><span class="line">        <span class="variable language_">document</span>.<span class="property">documentElement</span>.<span class="property">scrollTop</span> = btn1[num1].<span class="property">offsetTop</span></span><br><span class="line">    &#125;)</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure><h2 id="4-client家族"><a href="#4-client家族" class="headerlink" title="4.client家族"></a>4.client家族</h2><ol><li><p>获取宽高：获取元素的可见部分宽高（不包含边框，滚动条等）, clientWidth和clientHeight</p></li><li><p>获取位置： 获取左边框和上边框宽度, clientLeft和clientTop 注意是只读属性</p></li></ol><figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">let</span> num1 = <span class="variable language_">document</span>.<span class="title function_">querySelector</span>(<span class="string">&#x27;.box&#x27;</span>)</span><br><span class="line"><span class="comment">// 可见区域的宽高 不包含滚动条 边框...</span></span><br><span class="line"><span class="variable language_">console</span>.<span class="title function_">log</span>(num1.<span class="property">clientWidth</span>)</span><br><span class="line"><span class="variable language_">console</span>.<span class="title function_">log</span>(num1.<span class="property">clientHeight</span>)</span><br><span class="line"><span class="comment">// 3. client TOP/Left (了解) 就是边框的宽高</span></span><br><span class="line"><span class="variable language_">console</span>.<span class="title function_">log</span>(num1.<span class="property">clientTop</span>)</span><br><span class="line"><span class="variable language_">console</span>.<span class="title function_">log</span>(num1.<span class="property">clientLeft</span>)</span><br></pre></td></tr></table></figure><h4 id="会在窗口尺寸改变的时候触发事件：resize"><a href="#会在窗口尺寸改变的时候触发事件：resize" class="headerlink" title="会在窗口尺寸改变的时候触发事件：resize"></a>会在窗口尺寸改变的时候触发事件：resize</h4><figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">// 2. resize事件 当窗口变化时触发的事件</span></span><br><span class="line"><span class="variable language_">window</span>.<span class="title function_">addEventListener</span>(<span class="string">&#x27;resize&#x27;</span>, <span class="keyword">function</span> (<span class="params"></span>) &#123;</span><br><span class="line">    <span class="comment">// 检测屏幕宽度</span></span><br><span class="line">    <span class="variable language_">console</span>.<span class="title function_">log</span>(<span class="variable language_">document</span>.<span class="property">documentElement</span>.<span class="property">clientWidth</span>)</span><br><span class="line">    <span class="comment">// 检测页面的宽度不同而改变颜色</span></span><br><span class="line">    <span class="keyword">let</span> num2 = <span class="variable language_">document</span>.<span class="property">documentElement</span>.<span class="property">clientWidth</span></span><br><span class="line">    <span class="keyword">if</span> (num2 &gt;= <span class="number">1000</span>) &#123;</span><br><span class="line">        <span class="variable language_">document</span>.<span class="property">body</span>.<span class="property">style</span>.<span class="property">backgroundColor</span> = <span class="string">&#x27;skyblue&#x27;</span></span><br><span class="line">    &#125; <span class="keyword">else</span> <span class="keyword">if</span> (num2 &gt;= <span class="number">850</span>) &#123;</span><br><span class="line">        <span class="variable language_">document</span>.<span class="property">body</span>.<span class="property">style</span>.<span class="property">backgroundColor</span> = <span class="string">&#x27;pink&#x27;</span></span><br><span class="line">    &#125; <span class="keyword">else</span> &#123;</span><br><span class="line">        <span class="variable language_">document</span>.<span class="property">body</span>.<span class="property">style</span>.<span class="property">backgroundColor</span> = <span class="string">&#x27;green&#x27;</span></span><br><span class="line">    &#125;</span><br><span class="line">&#125;)</span><br></pre></td></tr></table></figure><h2 id="5-三大家族的区别"><a href="#5-三大家族的区别" class="headerlink" title="5. 三大家族的区别"></a>5. 三大家族的区别</h2><h3 id="1-offset家族"><a href="#1-offset家族" class="headerlink" title="1. offset家族"></a>1. offset家族</h3><ol><li><p>获取元素自身大小：包括自身设置的宽高、padding、border</p></li><li><p>获取元素距离定位父级的左和上距离 只读属性</p></li></ol><h3 id="2-scroll家族-1"><a href="#2-scroll家族-1" class="headerlink" title="2. scroll家族"></a>2. scroll家族</h3><ol><li><p>获取元素内容的总大小</p></li><li><p>获取元素向左向上滚出去看不见的距离 可读写属性</p></li></ol><h3 id="3-client家族"><a href="#3-client家族" class="headerlink" title="3. client家族"></a>3. client家族</h3><ol><li><p>获取元素可见区域的大小</p></li><li><p>获取元素左、上边框距离 只读属性</p></li></ol><h2 id="6-轮播图案例"><a href="#6-轮播图案例" class="headerlink" title="6. 轮播图案例"></a>6. 轮播图案例</h2><ol><li><p>需求①：小图标鼠标经过事件</p></li><li><p>需求② ：大图片跟随变化</p></li><li><p>需求③：右侧按钮播放效果</p></li><li><p>需求④：解决一个BUG</p></li><li><p>需求⑤：左侧按钮播放效果</p></li><li><p>需求⑥： 因为左侧按钮和右侧按钮里面有大量相同的操作，可以抽取封装一个函数 common</p></li><li><p>需求⑦：开启定时器需求</p></li><li><p>⑧： 鼠标经过停止定时器 （清除定时器） 鼠标离开开启定时器 （开启定时器）</p></li></ol><figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br><span class="line">54</span><br><span class="line">55</span><br><span class="line">56</span><br><span class="line">57</span><br><span class="line">58</span><br><span class="line">59</span><br><span class="line">60</span><br><span class="line">61</span><br><span class="line">62</span><br><span class="line">63</span><br><span class="line">64</span><br><span class="line">65</span><br><span class="line">66</span><br><span class="line">67</span><br><span class="line">68</span><br><span class="line">69</span><br><span class="line">70</span><br><span class="line">71</span><br><span class="line">72</span><br><span class="line">73</span><br><span class="line">74</span><br><span class="line">75</span><br><span class="line">76</span><br><span class="line">77</span><br><span class="line">78</span><br><span class="line">79</span><br><span class="line">80</span><br><span class="line">81</span><br><span class="line">82</span><br><span class="line">83</span><br><span class="line">84</span><br><span class="line">85</span><br><span class="line">86</span><br><span class="line">87</span><br><span class="line">88</span><br><span class="line">89</span><br><span class="line">90</span><br><span class="line">91</span><br><span class="line">92</span><br><span class="line">93</span><br><span class="line">94</span><br><span class="line">95</span><br><span class="line">96</span><br><span class="line">97</span><br><span class="line">98</span><br><span class="line">99</span><br><span class="line">100</span><br><span class="line">101</span><br><span class="line">102</span><br><span class="line">103</span><br><span class="line">104</span><br><span class="line">105</span><br><span class="line">106</span><br></pre></td><td class="code"><pre><span class="line">&lt;div <span class="keyword">class</span>=<span class="string">&quot;main&quot;</span>&gt;</span><br><span class="line">    &lt;div class=&quot;slides&quot;&gt;</span><br><span class="line">        &lt;ul&gt;</span><br><span class="line">            &lt;li class=&quot;active&quot;&gt;&lt;a href=&quot;#&quot;&gt;&lt;img src=&quot;./images/b_01.jpg&quot; alt=&quot;第1张图的描述信息&quot;&gt;&lt;/a&gt;&lt;/li&gt;</span><br><span class="line">            &lt;li&gt;&lt;a href=&quot;#&quot;&gt;&lt;img src=&quot;./images/b_02.jpg&quot; alt=&quot;第2张图的描述信息&quot;&gt;&lt;/a&gt;&lt;/li&gt;</span><br><span class="line">        &lt;/ul&gt;</span><br><span class="line">        &lt;div class=&quot;extra&quot;&gt;</span><br><span class="line">            &lt;h3&gt;第1张图的描述信息&lt;/h3&gt;</span><br><span class="line">            &lt;a class=&quot;prev&quot; href=&quot;javascript:;&quot;&gt;&lt;/a&gt;</span><br><span class="line">            &lt;a class=&quot;next&quot; href=&quot;javascript:;&quot;&gt;&lt;/a&gt;</span><br><span class="line">        &lt;/div&gt;</span><br><span class="line">    &lt;/div&gt;</span><br><span class="line">    &lt;div class=&quot;indicator&quot;&gt;</span><br><span class="line">        &lt;ul&gt;</span><br><span class="line">            &lt;li class=&quot;active&quot;&gt;</span><br><span class="line">                &lt;img src=&quot;images/s_01.jpg&quot;&gt;</span><br><span class="line">                &lt;span class=&quot;mask&quot;&gt;&lt;/span&gt;</span><br><span class="line">                &lt;span class=&quot;border&quot;&gt;&lt;/span&gt;</span><br><span class="line">            &lt;/li&gt;</span><br><span class="line">            &lt;li&gt;</span><br><span class="line">                &lt;img src=&quot;images/s_02.jpg&quot;&gt;</span><br><span class="line">                &lt;span class=&quot;mask&quot;&gt;&lt;/span&gt;</span><br><span class="line">                &lt;span class=&quot;border&quot;&gt;&lt;/span&gt;</span><br><span class="line">            &lt;/li&gt;</span><br><span class="line">        &lt;/ul&gt;</span><br><span class="line">    &lt;/div&gt;</span><br><span class="line">&lt;/div&gt;</span><br><span class="line">let xl = document.querySelectorAll(&#x27;.indicator li&#x27;)</span><br><span class="line">let dl = document.querySelectorAll(&#x27;.slides ul li&#x27;)</span><br><span class="line">let text = document.querySelector(&#x27;.extra h3&#x27;)</span><br><span class="line">let btn = document.querySelector(&#x27;.next&#x27;)</span><br><span class="line">let btn1 = document.querySelector(&#x27;.prev&#x27;)</span><br><span class="line">let main = document.querySelector(&#x27;.main&#x27;)</span><br><span class="line">for (let num1 = 0; num1 &lt; xl.length; num1++) &#123;</span><br><span class="line">    // 1.鼠标经过小图片变高亮</span><br><span class="line">    xl[num1].addEventListener(&#x27;mouseenter&#x27;, function () &#123;</span><br><span class="line">        document.querySelector(&#x27;.indicator .active&#x27;).classList.remove(&#x27;active&#x27;)</span><br><span class="line">        this.classList.add(&#x27;active&#x27;)</span><br><span class="line">    // 2. 鼠标经过当前小图片后大图片变化</span><br><span class="line">    // 利用opacity实现淡入淡出效果</span><br><span class="line">        document.querySelector(&#x27;.slides .active&#x27;).classList.remove(&#x27;active&#x27;)</span><br><span class="line">        dl[num1].classList.add(&#x27;active&#x27;)</span><br><span class="line">    // 3. 鼠标经过图片 文字改变</span><br><span class="line">        text.innerHTML = `第$&#123;num1 + 1&#125;张图的描述信息`</span><br><span class="line"></span><br><span class="line">    // 6. 解决Bug 如果鼠标经过后 再次点击播放会乱序</span><br><span class="line">    // 让index重新赋值为 当前鼠标经过索引号</span><br><span class="line">        index = num1</span><br><span class="line">    &#125;)</span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line">// 4. 右侧按钮点击事件</span><br><span class="line">// 全局变化量变量 不断自增 控制器/给左右按钮同时使用</span><br><span class="line">let index = 0</span><br><span class="line">btn.addEventListener(&#x27;click&#x27;, function () &#123;</span><br><span class="line">    index++  // 变量点击后自增</span><br><span class="line"></span><br><span class="line">    // 1. 解决点击最后一张后报错 等于10之后index为0</span><br><span class="line">    if (index == 10) &#123;</span><br><span class="line">        index = 0</span><br><span class="line">    &#125;</span><br><span class="line">    // 2. // 10 10 余 0</span><br><span class="line">    // index = index % 10 </span><br><span class="line">    fn()</span><br><span class="line">&#125;)</span><br><span class="line"></span><br><span class="line">// 5.左侧按钮点击事件</span><br><span class="line">btn1.addEventListener(&#x27;click&#x27;, function () &#123;</span><br><span class="line">    index--</span><br><span class="line">    if (index &lt; 0) &#123;</span><br><span class="line">        index = 9</span><br><span class="line">    &#125;</span><br><span class="line">    // 10 + -1 = 9 % 10 余 1</span><br><span class="line">    // index = (10 + index) % xl.length</span><br><span class="line">    fn()</span><br><span class="line">&#125;)</span><br><span class="line"></span><br><span class="line">// 6. 因为左右按钮有大量相同代码 可以封装成函数 然后调用</span><br><span class="line">function fn() &#123;</span><br><span class="line">    // 选出 index 大/小图片 排它思想</span><br><span class="line">    document.querySelector(&#x27;.indicator .active&#x27;).classList.remove(&#x27;active&#x27;)</span><br><span class="line">    xl[index].classList.add(&#x27;active&#x27;)</span><br><span class="line">    document.querySelector(&#x27;.slides .active&#x27;).classList.remove(&#x27;active&#x27;)</span><br><span class="line">    dl[index].classList.add(&#x27;active&#x27;)</span><br><span class="line">    text.innerHTML = `第$&#123;index + 1&#125;张图的描述信息`</span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line">// 7. 开启轮播定时器</span><br><span class="line">let timer = setInterval(function () &#123;</span><br><span class="line">// 自动调用右侧按钮点击事件</span><br><span class="line">    btn.click()</span><br><span class="line">&#125;, 800)</span><br><span class="line"></span><br><span class="line">// 如果不清除 点击哪个就不会停止</span><br><span class="line">// 8.鼠标经过清除定时器</span><br><span class="line">main.addEventListener(&#x27;mouseenter&#x27;, function () &#123;</span><br><span class="line">    clearInterval(timer)</span><br><span class="line">&#125;)</span><br><span class="line"></span><br><span class="line">// 9. 鼠标经过开启定时器</span><br><span class="line">main.addEventListener(&#x27;mouseleave&#x27;, function () &#123;</span><br><span class="line">// 直接再开启一个定时器 不要重新赋值了</span><br><span class="line">    timer = setInterval(function () &#123;</span><br><span class="line">        btn.click()</span><br><span class="line">    &#125;, 800)</span><br><span class="line">&#125;)</span><br></pre></td></tr></table></figure><hr><h4 id="本节单词"><a href="#本节单词" class="headerlink" title="本节单词:"></a>本节单词:</h4><ol><li>scroll</li><li>window</li><li>load</li><li>DOMContentLoaded</li><li>offset</li><li>client</li><li>resize</li></ol></article><div class="post-copyright"><div class="post-copyright__author"><span class="post-copyright-meta">本文作者:</span> <span class="post-copyright-info"><a href="https://webxc.eu.org">XC's Blog</a></span></div><div class="post-copyright__type"><span 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class="toc-link" href="#DOM-%E7%BD%91%E9%A1%B5%E7%89%B9%E6%95%88"><span class="toc-number">1.</span> <span class="toc-text">DOM- 网页特效</span></a></li></ol><li class="toc-item toc-level-2"><a class="toc-link" href="#1-%E6%BB%9A%E5%8A%A8%E4%BA%8B%E4%BB%B6%E5%92%8C%E5%8A%A0%E8%BD%BD%E4%BA%8B%E4%BB%B6"><span class="toc-number"></span> <span class="toc-text">1. 滚动事件和加载事件</span></a><ol class="toc-child"><li class="toc-item toc-level-3"><a class="toc-link" href="#1-%E6%BB%9A%E5%8A%A8%E4%BA%8B%E4%BB%B6scroll"><span class="toc-number">1.</span> <span class="toc-text">1. 滚动事件scroll</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#2-%E5%8A%A0%E8%BD%BD%E4%BA%8B%E4%BB%B6load"><span class="toc-number">2.</span> <span class="toc-text">2. 加载事件load</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#3-%E5%8A%A0%E8%BD%BD%E4%BA%8B%E4%BB%B6DOMContentLoaded"><span class="toc-number">3.</span> <span class="toc-text">3. 加载事件DOMContentLoaded</span></a></li></ol></li><li class="toc-item toc-level-2"><a class="toc-link" href="#2-scroll%E5%AE%B6%E6%97%8F"><span class="toc-number"></span> <span class="toc-text">2. scroll家族</span></a><ol class="toc-child"><li class="toc-item toc-level-5"><a class="toc-link" href="#%E8%8E%B7%E5%8F%96%E4%BD%8D%E7%BD%AE"><span class="toc-number">0.0.1.</span> <span class="toc-text">获取位置:</span></a></li><li class="toc-item toc-level-5"><a class="toc-link" href="#%E5%BC%80%E5%8F%91%E4%B8%AD%EF%BC%8C%E6%88%91%E4%BB%AC%E7%BB%8F%E5%B8%B8%E6%A3%80%E6%B5%8B%E9%A1%B5%E9%9D%A2%E6%BB%9A%E5%8A%A8%E7%9A%84%E8%B7%9D%E7%A6%BB%EF%BC%8C%E6%AF%94%E5%A6%82%E9%A1%B5%E9%9D%A2%E6%BB%9A%E5%8A%A8100%E5%83%8F%E7%B4%A0%EF%BC%8C%E5%B0%B1%E5%8F%AF%E4%BB%A5%E6%98%BE%E7%A4%BA%E4%B8%80%E4%B8%AA%E5%85%83%E7%B4%A0%EF%BC%8C%E6%88%96%E8%80%85%E5%9B%BA%E5%AE%9A%E4%B8%80%E4%B8%AA%E5%85%83%E7%B4%A0"><span class="toc-number">0.0.2.</span> <span class="toc-text">开发中，我们经常检测页面滚动的距离，比如页面滚动100像素，就可以显示一个元素，或者固定一个元素</span></a></li></ol></li><li class="toc-item toc-level-4"><a class="toc-link" href="#%E9%A1%B5%E9%9D%A2%E6%BB%9A%E5%8A%A8%E6%98%BE%E7%A4%BA%E8%BF%94%E5%9B%9E%E9%A1%B6%E9%83%A8%E6%8C%89%E9%92%AE"><span class="toc-number">0.1.</span> <span class="toc-text">页面滚动显示返回顶部按钮</span></a></li><li class="toc-item toc-level-2"><a class="toc-link" href="#3-offset%E5%AE%B6%E6%97%8F"><span class="toc-number"></span> <span class="toc-text">3.offset家族</span></a><ol class="toc-child"><li class="toc-item toc-level-4"><a class="toc-link" href="#%E8%8E%B7%E5%8F%96%E5%AE%BD%E9%AB%98"><span class="toc-number">0.1.</span> <span class="toc-text">获取宽高:</span></a></li><li class="toc-item toc-level-4"><a class="toc-link" href="#%E8%8E%B7%E5%8F%96%E4%BD%8D%E7%BD%AE-1"><span class="toc-number">0.2.</span> <span class="toc-text">获取位置:</span></a></li><li class="toc-item toc-level-4"><a class="toc-link" href="#%E4%BB%BF%E4%BA%AC%E4%B8%9C%E5%9B%BA%E5%AE%9A%E5%AF%BC%E8%88%AA%E6%A0%8F%E6%A1%88%E4%BE%8B"><span class="toc-number">0.3.</span> <span class="toc-text">仿京东固定导航栏案例</span></a></li><li class="toc-item toc-level-4"><a class="toc-link" href="#%E7%94%B5%E6%A2%AF%E5%AF%BC%E8%88%AA%E6%A1%88%E4%BE%8B"><span class="toc-number">0.4.</span> <span class="toc-text">电梯导航案例</span></a></li></ol></li><li class="toc-item toc-level-2"><a class="toc-link" href="#4-client%E5%AE%B6%E6%97%8F"><span class="toc-number"></span> <span class="toc-text">4.client家族</span></a><ol class="toc-child"><li class="toc-item toc-level-4"><a class="toc-link" href="#%E4%BC%9A%E5%9C%A8%E7%AA%97%E5%8F%A3%E5%B0%BA%E5%AF%B8%E6%94%B9%E5%8F%98%E7%9A%84%E6%97%B6%E5%80%99%E8%A7%A6%E5%8F%91%E4%BA%8B%E4%BB%B6%EF%BC%9Aresize"><span class="toc-number">0.1.</span> <span class="toc-text">会在窗口尺寸改变的时候触发事件：resize</span></a></li></ol></li><li class="toc-item toc-level-2"><a class="toc-link" href="#5-%E4%B8%89%E5%A4%A7%E5%AE%B6%E6%97%8F%E7%9A%84%E5%8C%BA%E5%88%AB"><span class="toc-number"></span> <span class="toc-text">5. 三大家族的区别</span></a><ol class="toc-child"><li class="toc-item toc-level-3"><a class="toc-link" href="#1-offset%E5%AE%B6%E6%97%8F"><span class="toc-number">1.</span> <span class="toc-text">1. offset家族</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#2-scroll%E5%AE%B6%E6%97%8F-1"><span class="toc-number">2.</span> <span class="toc-text">2. scroll家族</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#3-client%E5%AE%B6%E6%97%8F"><span class="toc-number">3.</span> <span class="toc-text">3. client家族</span></a></li></ol></li><li class="toc-item toc-level-2"><a class="toc-link" href="#6-%E8%BD%AE%E6%92%AD%E5%9B%BE%E6%A1%88%E4%BE%8B"><span class="toc-number"></span> <span class="toc-text">6. 轮播图案例</span></a><ol class="toc-child"><li class="toc-item toc-level-4"><a class="toc-link" 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